NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Tester Manufacturer
Imported cable fault detector Cable fault tester On-site test method Imported cable fault detector 1) Find out the cause of the fault and the basic situation of the cable, such as whether it is a weekly failure or a pre-test failure, whether it is a new cable or a long running time The cable, the approximate length of the cable, the high and medium grades of the cable are far from a little known, whether the cable has failed before, whether the cable is directly buried or laid in the cable trench, and the type of cable. 2) It must be clear that the cable must be disconnected from the other path at both times to ensure that the cable has no electricity and the surrounding environment of the cable is in a safe and sound state. 3) The tester must pay attention to always discharge the short-circuit wire between each phase wire and the ground before connecting to the cable. When discharging, the short-circuit wire must be grounded first, and on the other hand, each phase wire of the cable must be connected separately. Discharge *electricity.
For other electrical materials, such as capacitors, test transformers, etc., it is also necessary to pay attention to discharge the power before connecting and disconnecting the connecting lines, and then connect them. All in all, it is necessary to have the habit of capricious operation, even if it is difficult to do it, before each operation, first carefully operate whether the electric material is continuous with the circuit, and discharge first before operating. 4) During the test, first use the low-voltage pulse function of the flash tester to expand the slope height test for each phase of the cable, and see if the test waveforms are consistent when the three-phase armor is tested.
For most high-impedance faults, the test waveforms for each phase are consistent. For low-resistance faults and high-resistance faults with open-phase faults remaining, the test waveform of the faulty phase is inconsistent with the full length of the tested cable, so that low-voltage pulses can always be used to test the fault and leave. 5) When using the high-voltage flashover method to test, any cable fault is a high-resistance fault or a low-resistance fault, which can be tested by the high-voltage flashover method.
In this regard, the low-resistance or disconnection fault of the fault distance can be directly tested with low-voltage pulses as far as possible, and it seems that high-voltage flashing should be used to confirm the test and set the fault point. 6) Up to the high-voltage flashover method test, the fault distance is specified, so why not expand the fault anchorage. When using the acousto-magnetic co-vessel locator, fault fixation and path detection can be performed simultaneously.
On-site test method of cable fault tester Imported cable fault detector Shenzhen Noyafa Electronic Technology Co., Ltd.
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